{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{2}{c}}
\hline\hline
            &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}\\
            &\multicolumn{1}{c}{Wage Bill}&\multicolumn{1}{c}{Wage Bill p.w.}\\
\hline
assignment  &       22.82         &       17.15\sym{*}  \\
            &     (46.51)         &      (9.48)         \\
\hline
\(N\)       &         270         &         270         \\
R2          &        0.58         &        0.68         \\
Mean        &      470.11         &      139.91         \\
\hline\hline
\multicolumn{3}{l}{\footnotesize Standard errors in parentheses}\\
\multicolumn{3}{l}{\footnotesize \sym{*} \(p<0.10\), \sym{**} \(p<0.05\), \sym{***} \(p<0.01\)}\\
\end{tabular}
}
